Would it be worth it to retake a 750 Biology subject test and 780 math 2 subject test as a science major to ivies? Would that make a difference for an unhooked applicant with a 4.0 GPA and 1560 SAT or would time be better spent refining essays?
Oh hell no. The scores are fine. Move on to other aspects of your application.
None whatsoever.
Yup. This. Good luck.
Agree with @skieurope completely.
Congrats on your success and good luck!!